Started actually writing the accessibility code. Does not work yet.

wintable/new/accessibility.h

@@ -0,0 +1,75 @@
+// 24 december 2014
+
+struct tableAcc {
+	IAccessibleVtbl *vtbl;
+	ULONG refcount;
+	struct table *t;
+};
+
+static HRESULT STDMETHODCALLTYPE tableAccQueryInterface(IUnknown *this, REFIID riid, void **ppvObject)
+{
+	if (ppvObject == NULL)
+		return E_POINTER;
+	if (IsEqualIID(riid, IID_IUnknown) ||
+0)//		IsEqualIID(riid, IID_IDispatch)
+{//		IsEqualIID(riid, IID_IAccessible) {
+		*ppvObject = (void *) this;
+		return S_OK;
+	}
+	*ppvObject = NULL;
+	return E_NOINTERFACE;
+}
+
+#define TA ((struct tableAcc *) this)
+
+// TODO use InterlockedIncrement()/InterlockedDecrement() for these?
+
+static ULONG STDMETHODCALLTYPE tableAccAddRef(IUnknown *this)
+{
+	TA->refcount++;
+	return TA->refcount;
+}
+
+static ULONG STDMETHODCALLTYPE tableAccRelease(IUnknown *this)
+{
+	TA->refcount--;
+	if (TA->refcount == 0) {
+		tableFree(TA, "error freeing Table accessibility object");
+		return 0;
+	}
+	return TA->refcount;
+}
+
+static const IAccessibleVtbl tableAccVtbl = {
+	.QueryInterface = tableAccQueryInterface,
+	.AddRef = tableAccAddRef,
+	.Release = tableAccRelease,
+};
+
+static struct tableAcc *newTableAcc(struct table *t)
+{
+	struct tableAcc *ta;
+
+	ta = (struct tableAcc *) tableAlloc(sizeof (struct tableAcc), "error creating Table accessibility object");
+	ta->vtbl = &tableAccVtbl;
+	ta->vtbl->AddRef(vtbl);
+	ta->t = t;
+	return ta;
+}
+
+static void freeTableAcc(struct tableAcc *ta)
+{
+	ta->t = NULL;
+	ta->vtbl->Release(ta);
+}
+
+HANDLER(accessibilityHandler)
+{
+	if (uMsg != WM_GETOBJECT)
+		return FALSE;
+	if (wParam != OBJID_CLIENT)
+		return FALSE;
+	*lResult = LresultFromObject(IID_IUnknown, wParam, t->ta);
+	// TODO check *lResult
+	return TRUE;
+}

wintable/new/main.c

@@ -58,6 +58,9 @@ static void (*tablePanic)(const char *, DWORD) = NULL;
 
 static BOOL (*WINAPI tableTrackMouseEvent)(LPTRACKMOUSEEVENT);
 
+// forward declaration
+struct tableAcc;
+
 struct table {
 	HWND hwnd;
 	HWND header;
@@ -83,6 +86,7 @@ struct table {
 	BOOL checkboxMouseDown;
 	intptr_t checkboxMouseDownRow;
 	intptr_t checkboxMouseDownColumn;
+	struct tableAcc *ta;
 };
 
 #include "util.h"
@@ -98,6 +102,7 @@ struct table {
 #include "resize.h"
 #include "draw.h"
 #include "api.h"
+#include "accessibility.h"
 
 static const handlerfunc handlers[] = {
 	eventHandlers,
@@ -107,6 +112,7 @@ static const handlerfunc handlers[] = {
 	apiHandlers,
 	hscrollHandler,
 	vscrollHandler,
+	accessibilityHandler,
 	NULL,
 };
 
@@ -136,6 +142,7 @@ static LRESULT CALLBACK tableWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM
 			t->selectedRow = -1;
 			t->selectedColumn = -1;
 			loadCheckboxThemeData(t);
+			t->ta = newTableAcc(t);
 initDummyTableStuff(t);
 			SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) t);
 		}
@@ -146,6 +153,8 @@ initDummyTableStuff(t);
 printf("destroy\n");
 		// TODO free appropriate (after figuring this part out) components of t
 		// TODO send EVENT_OBJECT_DESTROY events to accessibility listeners (when appropriate); see the note on proxy objects as well
+		freeTableAcc(t->ta);
+		t->ta = NULL;
 		freeCheckboxThemeData(t);
 		destroyHeader(t);
 		tableFree(t, "error allocating internal Table data structure");